JP2654640B2 - Motorcycle engine suspension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION

The present invention relates to an engine suspension device for suspending a motorcycle engine from a body frame of the motorcycle.

[Prior art]

A conventional motorcycle engine suspension system is shown in FIGS. 5 and 6 and has left and right brackets 12a ', 12a opposed to a cross tube 11 provided between frames of a vehicle body.
b ′ is fixed by welding, etc.
Through holes drilled in 2a 'and 12b' and parts to be attached to engine 4
A bolt 5 'is passed through the through hole of 4a, and the left and right brackets 12a' and 12b 'and the engine 4 are formed by the inner surface of the head of the bolt 5' and the inner surface of the nut 16 'screwed into the tip of the bolt 5'.
Of the engine 4 to the body frame
Is suspended.

[Problems to be solved by the invention]

In the above-described conventional engine suspension, the dimensions between the outer surfaces of the mounting portion 4a of the engine 4 and the brackets 12a ',
Due to tolerances and manufacturing errors in the dimensions between the inner surfaces of 12b ', the outer surface of the mounting portion 4a of the engine 4 and the bracket 12
In many cases, a slight gap is formed between the inner surfaces of a 'and 12b'. Therefore, the inner surface of the head of the bolt 5 'and the inner surface of the nut 16' screwed into the bolt 5 'are bracketed.
When the parts 12a 'and 12b' and the mounting part 4a of the engine 4 are tightened, the brackets 12a 'and 12b' as shown by solid lines in FIG.
b ′ tends to curve inward and stress is generated in the curved portion, and if the distance L between the upper surface of the cross tube 11 and the center axis of the bolt 5 ′ cannot be made sufficiently large, the cross tube There is a defect that the engine 11 is cracked or the engine 4 cannot be completely fastened. Further, in the conventional engine suspension, the gap between the outer surface of the mounting portion 4a of the engine 4 and the inner surfaces of the brackets 12a 'and 12b' is small due to tolerances and manufacturing errors. For this reason, the conventional engine suspension device is used when attaching / detaching the engine for maintenance or the like.
The mounting portion 4a of the engine 4 is inserted between the pair of brackets 12a 'and 12b' of the body frame, and the brackets 12a 'and 12b'
There is a drawback that the work of detaching the attached portion 4a of the engine 4 from between b 'becomes very troublesome. The problem to be solved by the present invention is to provide an engine suspension for a motorcycle that does not have the above-mentioned disadvantages of the conventional engine suspension, in other words, to provide a support for an engine of a body frame by tightening a screw rod. It is an object of the present invention to provide an engine suspension device for a motorcycle which can prevent deformation of the engine and the like, and can improve workability of attaching and detaching an engine to a vehicle body frame.

[Means for Solving the Problems]

The present invention provides, as means for solving the above problems,
The following configuration of the invention is adopted. According to the configuration of the present invention, the left and right brackets are fixed to a cross member extending in the width direction of the vehicle body forming a part of the vehicle body frame, the left and right brackets are provided with through holes, and the mounted portion of the engine is integrated with the engine. A through-hole is formed in the mounting portion, the mounting portion of the engine is inserted between the left and right brackets, and a screw rod is inserted into the through-hole of the bracket or the mounting portion of the engine, whereby the engine is mounted. In a motorcycle fixed to a vehicle body frame, a gap between inner surfaces of opposed left and right brackets is made sufficiently larger than a gap between outer surfaces of a portion to which an engine is mounted, and clamped to one bracket. The clamp portion is composed of a split groove that can change the diameter of the through hole of the bracket, and fixing means that includes a tightening bolt that changes the interval between the split grooves. The threaded rod has a threaded portion at its leading end and a proximal end having a diameter larger than the diameter of the through hole of the mounting portion of the engine at the proximal side, and the mounting portion of the engine at the end of the proximal end. A contact portion is formed to abut against the side surface of the bracket, and the mounting portion of the engine is inserted between the inner side surfaces of the left and right brackets. A nut is inserted into the through-hole and the through-hole of the other bracket, and a nut is screwed into a threaded portion of the threaded rod protruding outside of the other bracket, and a contact portion between the inner surface of the nut and the proximal end of the threaded rod. With this, the other bracket and the mounting portion of the engine are tightened, and the base end of the threaded rod is fixed to one bracket by tightening the clamp portion with the tightening bolt, and the inner surface of one bracket and the inner surface The opposite engine In engine suspension device for a motorcycle, characterized by being configured so that a gap resides between the side surface of the biasing portion.

【Example】

As shown in FIGS. 1 to 4, a pair of left and right main frames 2 extend obliquely downward and rearward from the head pipe 1, and the vicinity of the front end and the lower rear end of the main frame 2 A pair of left and right down tubes 3 is fixed between the two, and these constitute a body frame. An engine 4 is suspended on the body frame by threaded rods 5, 6, 7 via brackets. A seat rail 8 and the like are fixed to the main frame 2,
A rear arm 10 supporting the rear wheel 9 is also pivotally supported. A cross tube 11 is bridged between the lower and rear ends of the pair of main frames 2, and left and right brackets 12 a and 12 b are fixed to the cross tube 11 so as to face each other by welding or the like, and left and right brackets 12 a and 12 b Of the engine 4 is sufficiently larger than the distance between the outer surfaces of the mounting portion 4a of the engine 4. The engine 4 has a mounting portion 4a having left and right brackets 12a.
a and 12b are inserted between the inner side surfaces and are suspended by the screw rod 5. The screw rod 5 has a base to which the engine 4 is attached.
A base portion 5a having a diameter larger than the diameter of the through hole 4a, a threaded portion 5b provided on the tip side thereof, and an end of the base portion 5a abutting against the side surface of the mounting portion 4a of the engine 4 at the end thereof. Use the one in which 5c is formed. One of the brackets 12a is provided with a through hole 13 through which the base end 5a of the screw rod 5 can be inserted.
A clamp portion 15 including a fastening bolt 14 and the like is provided. Then, the screw portion 5b of the screw rod 5 is connected to the one bracket 12
a through the through hole 13 of the engine 4, through the through hole of the mounting portion 4 a of the engine 4 and the through hole of the other bracket 12 b, and with the threaded portion 5 b therefrom protruding outside the bracket 12 b, A nut 16 is screwed into the screw portion 5b and fastened.
As a result, the contact portion 5c of the threaded rod 5 presses the side surface of the mounting portion 4a of the engine 4, and the mounting portion 4a of the engine 4 is tightened and integrated with the bracket 12b as a reference. Thereafter, the base end portion 5a of the screw rod 5 is clamped by tightening the tightening bolt 14 of the clamp portion 15, and the engine 4 is suspended and fixed at the attached portion 4a. In addition, as shown in FIGS. 1 and 2, the clamp portion 15 forms a split groove 15a communicating with the through hole 13 at a portion from the tip of one bracket 12a, and is divided by the split groove 15a. One part 15b is provided with a through hole for passing the tightening bolt 14, and the other part 15c is provided with a screw hole for screwing the screw portion of the tightening bolt 14, and the tightening bolt 14 is passed through the through hole of the one part 15b. When the tightening bolt 14 is turned in the tightening direction, the gap of the split groove 15a is reduced, the diameter of the through hole 13 of the bracket 12a is reduced, and the diameter of the screw rod 5 is reduced. The main shaft 5a is clamped, and the tightening bolt
When the nut 14 is turned in the anti-tightening direction, the gap of the split groove 15a increases, the diameter of the through hole 13 of the bracket 12a increases, and the tightening of the base shaft portion 5a of the screw rod 5 is released. The distance between the inner surfaces of the left and right brackets 12a and 12b is made sufficiently larger than the distance between the outer surfaces of the mounting portion 4a of the engine 4 so that the left side (that is, the inner side) of one bracket 12a and the left side The mounting portion 4a of the engine 4 can be fixed to the brackets 12a and 12b in a state where there is a gap t between the surface and the right side surface (that is, the outer surface) of the mounting portion 4a of the engine 4 facing the surface. I have. Therefore, the bracket 12a,
A structure in which the engine 4 can be reliably suspended at the mounting portion 4a without any bending of the 12b, and the dimension between the upper surface of the cross tube 11 and the center axis of the threaded rod 5 cannot be sufficiently obtained. Even in this case, since no mounting stress is generated on the brackets 12a and 12b, no crack is generated in the cross tube. Further, it is possible to prevent the engine 4 from being sufficiently tightened. Also, as shown in FIG. 1, the interval between the inner side surfaces of the brackets 12a and 12b is sufficiently larger than the interval between the outer side surfaces of the mounting portion 4a of the engine 4, so that maintenance is performed. Engine attachment / detachment work becomes easy. That is, when the engine 4 is mounted on the vehicle body frame by adopting the configuration of the embodiment, the mounted portion 4a of the engine 4 is inserted between the brackets 12a and 12b. Since the distance between the side surfaces is sufficiently larger than the distance between the outer surfaces of the mounting portion 4a of the engine 4, the insertion becomes very easy. To remove the engine 4 from the vehicle body frame, turn the nut 16 in the counter-tightening direction to remove it, and turn the tightening bolt 14 in the counter-tightening direction to increase the interval between the split grooves 15b. The tightening of the part 5a is released, the screw rod 5 is pulled out, the pull-out mounting part 4a of the engine 4 is taken out from between the brackets 12a and 12b, and the engine 4 is removed from the body frame. Engine 4 between the sides
Is sufficiently larger than the distance between the outer surfaces of the attached portions 4a, so that it is very easy to take it out. In the above embodiment, the base end portion 5a of the threaded rod 5 has a large diameter, and the dimension in the length direction is relatively long. The length of the proximal end portion 5a in the central axis direction of the threaded rod 5 may be larger than the sum of the dimension of the gap t in the central axis direction and the dimension of the through hole 13 in the central axis direction.
In addition to the embodiment, a general bolt is used as the screw rod 5,
A collar may be fitted to the base of the bolt, the collar may be used as a base end, and one end of the collar may be used as an abutting part for abutting against a side surface of a mounting part (crankcase) of the engine 4. In the above embodiment, the suspension of the engine 4 by the screw rod 5 in FIG. 3 has been described.
The same applies to the suspension part of the engine according to FIG.

【The invention's effect】

The present invention has the following effects (a) and (b) by providing the requirements described in the claims. (A) In the motorcycle engine suspension device of the present invention, the interval between the inner surfaces of the opposed left and right brackets is made sufficiently larger than the interval between the outer surfaces of the mounting portion of the engine. Is provided, and the clamp portion is constituted by a fixing groove including a split groove capable of changing the diameter of the through hole of the bracket, and a tightening bolt for changing the interval between the split grooves, and the screw rod is provided on the tip side thereof. A threaded portion is provided, and a proximal portion having a diameter larger than the diameter of the through hole of the mounted portion of the engine is provided on the base side thereof, and an abutting portion that abuts against a side surface of the mounted portion of the engine at the end of the proximal portion. The mounting portion of the engine is formed between the inner surfaces of the left and right brackets, and the threaded rod is inserted from the outside of the one bracket into the through hole of the one bracket, the through hole of the mounting portion of the engine, and the through hole of the other bracket. Inserted into the hole A nut is screwed into a threaded portion protruding outside the other bracket of the rod, and the other bracket and the mounted portion of the engine are tightened by the inner surface of the nut and the contact portion of the proximal end of the threaded rod, and Since the base end of the threaded rod is fixed to one bracket by tightening the clamp with the tightening bolt, there is an error in the dimensions between the outer surfaces of the engine mounting part, the dimensions between the inner surfaces of the left and right brackets, etc. The engine can be reliably suspended and fixed to the vehicle body frame without generating any assembling stress such that the left and right brackets and the like are deformed even if there are dimensional tolerances. Also, since there is no assembling stress to deform the left and right brackets, no crack is generated in the cross member extending in the width direction of the vehicle body, which is a portion where the left and right brackets are disposed, and they are robust. It becomes something. (B) In the motorcycle engine suspension according to the present invention, the distance between the inner surfaces of the left and right brackets is made sufficiently larger than the distance between the outer surfaces of the engine mounting portion, and the inner surface of one bracket and the inner surface of the one bracket are connected to each other. The engine can be fixed to the vehicle body frame with a gap between the inner surface and the opposite side of the mounted part of the engine. Therefore, it is very easy to attach and detach the engine for maintenance etc. Become.

[Brief description of the drawings]

FIG. 1 is a front view showing a cross section of an essential part of an engine suspension system according to an embodiment, FIG. 2 is a side view showing a cross section taken along the line II-II of FIG. FIG. 4 is a side view of the engine suspension of the embodiment, FIG. 4 is a front view of the engine suspension of the embodiment, FIG. 5 is a front view showing a cross section of a main part of the conventional engine suspension, and FIG. The one shown in Fig. 5
FIG. 6 is a side view taken along a line VI-VI and viewed in a direction of an arrow. 2 ... Main frame, 4 ... Engine, 4a ... Mounted part 5,6,7 ... Screw rod, 5a ... Basic end part, 5b ... Screw part 5c ... Abutment part, 11 ... Cross Tube, 12a, 12b Bracket 13 Through hole, 14 Tightening bolt, 15 Clamp section 16 Nut, t Clearance

Claims (1)

(57) [Claims] 1. A left and right bracket is fixed to a cross member extending in a width direction of a vehicle body forming a part of a vehicle body frame,
A through hole is provided in the left and right brackets, a mounting portion of the engine is formed integrally with the engine, a through hole is provided in the mounting portion, the mounting portion of the engine is inserted between the left and right brackets, and a screw rod is provided. In a motorcycle in which the engine is fixed to the vehicle body frame by inserting the engine into the through hole of the bracket or the through hole of the part to be mounted on the engine, the distance between the inner surfaces of the opposed left and right brackets is A gap is made sufficiently larger than the gap between the outer surfaces of the mounting portion, and a clamp portion is provided on one bracket, and the clamp portion is capable of changing a diameter of a through hole of the bracket, and a gap between the split grooves. The threaded rod has a threaded portion at its tip and a proximal end having a diameter larger than the diameter of the through hole of the mounting portion of the engine on its proximal side. Prepared, A contact portion is formed at the end of the base end to abut against the side surface of the mounted portion of the engine, the mounted portion of the engine is inserted between the inner side surfaces of the left and right brackets, and the screw rod is inserted from the outside of one of the brackets. Through holes in the bracket,
A nut is inserted into the through hole of the mounting portion of the engine and the through hole of the other bracket, and a nut is screwed into a threaded portion of the threaded bar protruding outside of the other bracket. The other bracket and the part to be mounted on the engine are tightened with the contact part at the end, and the base end of the threaded rod is fixed to one bracket by tightening the clamp with the tightening bolts. An engine suspension system for a motorcycle, characterized in that a gap is provided between the side surface and the side surface of the portion to be mounted of the engine facing the inner surface.